BaseX-Talk April 2016

basex-talk@mailman.uni-konstanz.de

37 participants
48 discussions

XPath Java examples for BaseX
by Pubudu Fernando 27 Apr '16

27 Apr '16

Hi All, Are there any samples on evaluating and processing XPath expressions using BaseX in Java? I had a look at [1], but there only seem to be XQuery examples? [1] - http://docs.basex.org/wiki/Java_Examples Thanks -- *Pubudu Fernando* Software Engineer - Intern WSO2 Inc. m: +94 77 888 2543 <https://lk.linkedin.com/in/pubuduf> <http://blog.pubudu.xyz/> <https://github.com/pubudu91> <http://stackoverflow.com/users/4329912/pubudu>

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Cascaded Treemaps
by Carl Witt 26 Apr '16

26 Apr '16

Hello everyone, I’m an occasional user of BaseX and I like the program very much. One thing that could be improved is the treemap view. Cascaded tree maps have been proposed for better visualization of the nesting structure [1]. An example is available here [2]. I think this could help exploring the structure of XML documents better. For example, I think it takes a little too much practice and attention to the nuances to construct the tree on the right from the tree map on the left. Great software, though. Best, Carl Witt [1] Lü, Hao, and James Fogarty. "Cascaded treemaps: examining the visibility and stability of structure in treemaps." Proceedings of graphics interface 2008. Canadian Information Processing Society, 2008. [2] http://bl.ocks.org/nitaku/142545ea7bac1866327a <http://bl.ocks.org/nitaku/142545ea7bac1866327a>

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Function must not be updating error in 8.4.3 (not in 8.4.2)
by Marc van Grootel 26 Apr '16

26 Apr '16

Hi, I'm sorry for the vague report. I can do more digging but it's happening deep inside some code and it's hard to pinpoint. In 8.4.3 I get the following error message: [XPTY0004] Function must not be updating: %updating function($result,$tran.... In 8.4.2 and before the same code works as expected. What I can say that it's happening in a fold-left function which in it's body uses an xslt transform (using Saxon). I have MIXUPDATES=true. I'm not touching the database inside this code but I can say that the fn call in which the fold-left is located does contain a couple of db:* functions (but they are not in the active code path). That's all I can offer at the moment. I'm happy to do some more digging later but I wanted to post this just in case it gives someone a hunch and it's only introduced since 8.4.2. Also tried 8.4.4-SNAPSHOT and there it's broken too. Cheers, --Marc

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Runtime Exception
by Mansi Sheth 25 Apr '16

25 Apr '16

Hello, My current BaseXDB is at 920GB, with ~230 databases... I run jetty server visa basexhttp script with giving it explicit 30GB of RAM. While trying to access a query, thru REST api via XQUERY, I get below error. HTTP/1.1 400 Bad Request^M Content-Type: text/plain;charset=UTF-8^M Content-Length: 4207^M Server: Jetty(8.1.16.v20140903)^M ^M Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.2.3 Java: Oracle Corporation, 1.7.0_95 OS: Linux, amd64 Stack Trace: java.lang.RuntimeException: *Data Access out of bounds:* *- pre value: 126882320* *- #used blocks: 495643* *- #total locks: 495643* *- access: 495642 (495643 > 495642]* at org.basex.util.Util.notExpected(Util.java:60) at org.basex.io.random.TableDiskAccess.cursor(TableDiskAccess.java:458) at org.basex.io.random.TableDiskAccess.read1(TableDiskAccess.java:148) at org.basex.data.Data.kind(Data.java:306) at org.basex.query.value.node.DBNode.<init>(DBNode.java:51) at org.basex.query.value.seq.DBNodeSeq.itemAt(DBNodeSeq.java:68) at org.basex.query.value.seq.DBNodeSeq.itemAt(DBNodeSeq.java:22) at org.basex.query.value.seq.Seq$1.next(Seq.java:77) at org.basex.query.expr.path.IterPath$1.next(IterPath.java:58) at org.basex.query.expr.path.IterPath$1.next(IterPath.java:36) at org.basex.query.MainModule$1.next(MainModule.java:114) at org.basex.query.func.StandardFunc.cache(StandardFunc.java:384) at org.basex.query.func.xquery.XQueryEval.eval(XQueryEval.java:129) at org.basex.query.func.xquery.XQueryEval.eval(XQueryEval.java:59) at org.basex.query.func.xquery.XQueryEval.value(XQueryEval.java:49) at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:77) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.gflwor.Let$LetEval.next(Let.java:187) at org.basex.query.expr.gflwor.GFLWOR$1.next(GFLWOR.java:95) at org.basex.query.MainModule$1.next(MainModule.java:114) at org.basex.core.cmd.AQuery.query(AQuery.java:91) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:398) at org.basex.http.rest.RESTCmd.run(RESTCmd.java:99) at org.basex.http.rest.RESTQuery.query(RESTQuery.java:74) at org.basex.http.rest.RESTRun.run0(RESTRun.java:41) at org.basex.http.rest.RESTCmd.run(RESTCmd.java:65) at org.basex.core.Command.run(Command.java:398) at org.basex.core.Command.execute(Command.java:100) at org.basex.core.Command.execute(Command.java:123) at org.basex.http.rest.RESTServlet.run(RESTServlet.java:22) at org.basex.http.BaseXServlet.service(BaseXServlet.java:64) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:745) -- - Mansi

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Restxq and java
by meumapple 22 Apr '16

22 Apr '16

Hi, I have developed a restxq service, which executes a command via the process module. The command is actually java (java -cp ...) which actionates a linguistic parser: unfortunately the time of loading/opening of the java process is quite long (14 sec., also at the command line) even if the actual parsing is very fast. I am looking for a way to keep such a java process "open", so that a user's request can be satisfied much much quickier (while now the java process is opened and then closed for each single request). I am not sure this is a question for Basex users (the problem is only due to java), but I am not a java developer at all and I am trying to understand what can be done in this respect. Thanks! Joseph

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file:read-binary error
by Maud Ingarao 20 Apr '16

20 Apr '16

Dear friends We updated 2 days ago from 8.2 to 8.4 and are experiencing a few strange things. Aside this : https://github.com/BaseXdb/basex/issues/702#issuecomment-212352923, we discovered that this kind of function doesn't work anymore : (:~ : resource function for the static files : : @param $file file or unknown path : @return rest response and binary file :) declare %rest:path('/synopsx/files/{$file=.+}') function synopsx.files:file($file as xs:string) as item()+ { let $path := $G:FILES || $file return ( <rest:response> <http:response> <http:header name='Cache-Control' value='max-age=3600,public'/> </http:response> <output:serialization-parameters> <output:media-type value='{ synopsx.files:mime-type($path) }'/> <output:method value='raw'/> </output:serialization-parameters> </rest:response>, file:read-binary($path)) }; Response : HTTP ERROR 400 Problem accessing /synopsx/files/synopsx.js. Reason: Stopped at /resource/basex/webapp/synopsx/_restxq/files.xqm, 38/10: [SEPM0017] Value of 'method' must be one of (xml,xhtml,html,json,csv,text,adaptive,basex). ------------------------------------------------------------------------ /Powered by Jetty:// /where, on my computer, an exact clone of the webapp runing with a 8.3 works perfectly and sends me my js file as expected. I read the changelogs but couldn't figure out what could be involved here. I tried to change "raw" to "adaptive" but then I get a file not found answer : HTTP ERROR 400 Problem accessing /synopsx/files/synopsx.js. Reason: Stopped at /resource/basex/webapp/synopsx/_restxq/files.xqm, 50/21: [file:not-found] '/resource/basex/webapp/synopsx/files/synopsx.js' does not exist. ------------------------------------------------------------------------ /Powered by Jetty:/// Thanks :)))) Maud PS : We're having a showcase with BaseX tomorrow at 4pm :( -- /« Ne travaillez jamais »/ *Maud Ingarao* IHRIM - UMR 5317 Institut d’histoire des représentations et des idées dans les modernités Ecole Normale Supérieure de Lyon - Site Descartes - Bureau R322 15 Parvis René Descartes - BP7000 - 69342 Lyon CEDEX 07 +33 4 37 37 65 79 - maud.ingarao(a)ens-lyon.fr http://ihrim.ens-lyon.fr http://institutdesanti.ens-lyon.fr http://ahn.ens-lyon.fr

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command script / batch-processing of xqueries
by Günter Dunz-Wolff 19 Apr '16

19 Apr '16

Hi all, hi Christian, I'm running some xqueries to create and update basex dbs over and over again. They all depend on the basic db 'mydata'. Whenever mydata is updated, I have to update the other dbs. 1. xq-file: db:create('mydata', path/to/my/xml ..... 2. xq-file: db:create('searchindex', let $data0 := db:open('mydata') ..... 3. xq-file: db:create('indd-xml', let $data0 := db:open('mydata').... 4. and so on First question: Is there any way to put the whole process into one command-script? Or is there any kind of other batch-processing? Second question: So far I'm creating the db 'mydata' with the GUI. I want to integrate the creating into the batch-processing via XQuery. In generell I know the create-command, but where to put the options: use XInclude, chop-whitespace OFF and Fulltext Language German internal, Stemming OFF, Case Sensitive and Diacritics ON? Can't find it in the docs. Thanks for any help, Günter

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Non-default admin user/pw for BaseX on Docker image
by Mike Cobo 18 Apr '16

18 Apr '16

Hi BaseX team, hi all I want to create a docker image based on the existing basexhttp image, but with other credentials for the admin user. For this reason I added an edited .basex file with changed password (here: mypassword) to the new docker image: .basex: ...# Client/Server ArchitectureHOST = localhostPORT = 1984SERVERPORT = 1984USER = adminPASSWORD = mypasswordSERVERHOST = ... Dockerfile: FROM basex/basexhttp:latestMAINTAINER Mike <myemail(a)mail.com>COPY .basex /srv/VOLUME ["/srv/BaseXData", "/srv/BaseXWeb"] After starting the docker container I checked if the edited file can be found under the path "/srv/.basex". The file is there but when I want to login to the database (or run an XQuery script via the browser) I cannot login with admin/mypassword. The erreor message is: Connection failed: Access denied. But I can still use the default user/pw (admin/admin) to connect. Why is the changed .basex file not loaded/parsed when starting the BaseX (http) server on the docker container? Should the file be copied to a different path? Best regards,Mike

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Exception for async + client
by Strasser Pablo 15 Apr '16

15 Apr '16

Hi, Playing with the nice new async and client library together to generate asynchronous remote query I got randomly the following exception: java.lang.ClassCastException: org.basex.query.value.seq.tree.BigSeq cannot be cast to org.basex.query.value.item.Item at org.basex.query.value.ValueBuilder.concat(ValueBuilder.java:37) at org.basex.query.expr.List.value(List.java:147) at org.basex.query.QueryContext.value(QueryContext.java:420) at org.basex.query.expr.If.value(If.java:131) at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:78) at org.basex.query.QueryContext.value(QueryContext.java:420) at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:129) at org.basex.query.func.FuncCall.invoke(FuncCall.java:87) at org.basex.query.func.FuncCall.value(FuncCall.java:159) at org.basex.query.value.item.FItem.invokeValue(FItem.java:45) at org.basex.query.func.hof.HofUntil.value(HofUntil.java:27) at org.basex.query.func.hof.HofUntil.iter(HofUntil.java:18) at org.basex.query.QueryContext.iter(QueryContext.java:409) at org.basex.query.expr.List$1.next(List.java:134) at org.basex.query.MainModule$1.next(MainModule.java:123) at org.basex.core.cmd.AQuery.query(AQuery.java:92) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:398) at org.basex.core.Command.execute(Command.java:100) at org.basex.server.ClientListener.run(ClientListener.java:136) This happen with the attached code where 10.0.0.5 is another basexserver than the current one. The code is a preliminary test on launching system command on another basexserver asynchronously. Have a nice evening. Pablo

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Problems with IPA diacritics display
by Bowers, Jack 14 Apr '16

14 Apr '16

Hi (again), (I have now signed up for the list) There seems to be a problem with displaying results in which the text has with IPA diacritics. The problem is only in the display of the data and not the source xml files or even those extracted from the search results in which these display problems are found. The problem is also not universal, in some cases they display fine, in others there are gaps in the text and characters overlapping. I've attached a screenshot of the results and a small file in which there are such characters diacritics which you can test on. For the record, I did activate the 'diacritics' option in the 'Full Text' portion of the menu, and I do have the IPA zip folder in that of the database source files It's essential for us to be able to display these characters and strings correctly for our research it would be greatly appreciated if you could give any insight or consider this issue in any future software updates! Thanks very much! Best Regards from Vienna, Jack Bowers Austrian Centre for Digital Humanities (ACDH) Österreichische Akademie der Wissenschaften (ÖAW) - Austrian Academy of Sciences http://www.oeaw.ac.at/acdh/ - http://wboe.oeaw.ac.at/

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BaseX-Talk April 2016